Effects of nitrogen deposition and biochar application on soil dissolved organic matter
MA Ya-pei, LI Yu-xuan, XIE Huan, CHENG Lei, SI You-tao, CHEN Yue-min, MA Hong-liang, GAO Ren, YIN Yun-feng
State Key Laboratory for Subtropical Mountain Ecology of the Ministry of Science and Technology and Fujian Province, School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
Abstract：A serious of pot experiments were conducted to investigate the effects of biochar (BC) application on the contents of soil dissolved organic carbon (DOC) and spectral properties of soil dissolved organic matter (DOM) of Cunninghamia lanceolata seedling under various nitrogen (N) deposition condition. Simulated N deposition treatments were performed with 0 (control), 40 (lower N deposition) and 80kgN/(hm2·a) (higher N deposition), and biochar application rates were 0 (control), 12 (lower BC application) and 36t/hm2 (higher BC application) under each N treatment. The soil pH was significantly decreased by 0.06 to 0.09unit (P<0.05) after 3months in the treatments of lower and higher N deposition alone compared with the control, respectively, but it was significantly increased by 0.32 to 0.94unit (P<0.05) in the treatments of BC application alone or BC application combined with N deposition. Compared with the control, the DOC content was decreased significantly in the treatment of lower N deposition alone, while it was significantly increased in the treatment of higher N deposition alone, and the DOM structure became simpler. The soil DOC content did not significantly change in the treatments of lower BC application alone or lower BC application combined with N deposition, but it was significantly increased from 30.1% to 95.6% in the treatments of higher BC application alone or higher BC application combined with N deposition, and the structure of DOM tended to be more complex. Redundancy analysis showed that the pH was the most important factor in controlling the properties of soil DOM among different treatments. These results implied that the higher application of BC could alleviate soil acidification in the short period, increase soil DOC content, and make DOM more stable under N deposition conditions.
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